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<p>High temperature stress is one of the important abiotic stresses for plants, which affects their in the growth and development as well as physiology. In this experiment, the appearance and morphology, physiology and biochemistry, and leaf anatomical structure of <i>Dendrobium nobile Lindl(D. nobile)</i> were systematically studied under high temperature stress by taking <i>D. nobile</i>. Firstly, the semi-lethal temperature of <i>D. nobile</i> was 43.08 ℃ according to the rate of cellular injury and the Logistic equation, then, 25 ℃ was chosen as the control, and the other 30 ℃, 35 ℃, and 40 ℃ were set up as the high temperature treatments. The results showed that the root, stem and leaf dry weights of the plants were significantly different under high temperature treatments at 35&#xa0;°C and 40&#xa0;°C compared with the control, with a decrease of 23.12%, 19.65% and 25.07% at 35&#xa0;°C compared with the control, respectively (<i>P</i> ≤ 0.05), and a decrease of 36.02%, 29.48% and 29.06% at 40&#xa0;°C compared with the control, respectively (<i>P</i> ≤ 0.05). Under 35&#xa0;°C treatment, plant Relative electrical conductivity(REC), Malondialdehyde(MDA), Superoxide Dismutase(SOD), Peroxidase(POD), Free proline(Pro), Soluble sugars(SS), Soluble protein(SP), Ascorbic acid(ASA), and P-glutathione(GSH) were significantly increased (<i>P</i> ≤ 0.05), with peaks of 40.65%, 63.98%, 37.65%, 39.92%, 67.45%, 36.93%, 35.48%, 44.94%, and 13.27%, respectively, from the control. Chlorophyll A(Chla), Chlorophyll B(Chlb), Total chlorophyll(Chla + b), Carotenoids(Car), and GSH decreased significantly (<i>P</i> ≤ 0.05) under 40&#xa0;°C treatment, with peaks of 28.38%, 28.15%, 25.49%, 22.71%, and 15.53%, respectively, compared with the control. Plant secondary metabolite flavonoid and polyphenol contents increased significantly (<i>P</i> ≤ 0.05) under 35&#xa0;°C treatment, with peaks of 59.95% and 36.14%, respectively, compared with the control. Plant flavonoid and polyphenol contents firstly increased and decreased with time under 40 ℃ treatment (<i>P</i> ≤ 0.05). Most of the physiological and biochemical indexes could recover growth after 35 ℃ treatment, while there was no significant recovery effect after 40 ℃ treatment. This experiment provides some theoretical basis for heat-resistant breeding and large-scale scientific cultivation of <i>D</i>. <i>nobile</i> in the tropics.</p>

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Physiological and Secondary Metabolism of Dendrobium nobile Lindl in Response to High Temperature Stress

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Linlong Xu,
  • Yijun Fan,
  • Xueyan Tan,
  • Jie Ma,
  • Ting Li,
  • Siyu He,
  • Hui Wang,
  • Liangjie Zhu,
  • Le Zeng,
  • Aoxue Luo

摘要

High temperature stress is one of the important abiotic stresses for plants, which affects their in the growth and development as well as physiology. In this experiment, the appearance and morphology, physiology and biochemistry, and leaf anatomical structure of Dendrobium nobile Lindl(D. nobile) were systematically studied under high temperature stress by taking D. nobile. Firstly, the semi-lethal temperature of D. nobile was 43.08 ℃ according to the rate of cellular injury and the Logistic equation, then, 25 ℃ was chosen as the control, and the other 30 ℃, 35 ℃, and 40 ℃ were set up as the high temperature treatments. The results showed that the root, stem and leaf dry weights of the plants were significantly different under high temperature treatments at 35 °C and 40 °C compared with the control, with a decrease of 23.12%, 19.65% and 25.07% at 35 °C compared with the control, respectively (P ≤ 0.05), and a decrease of 36.02%, 29.48% and 29.06% at 40 °C compared with the control, respectively (P ≤ 0.05). Under 35 °C treatment, plant Relative electrical conductivity(REC), Malondialdehyde(MDA), Superoxide Dismutase(SOD), Peroxidase(POD), Free proline(Pro), Soluble sugars(SS), Soluble protein(SP), Ascorbic acid(ASA), and P-glutathione(GSH) were significantly increased (P ≤ 0.05), with peaks of 40.65%, 63.98%, 37.65%, 39.92%, 67.45%, 36.93%, 35.48%, 44.94%, and 13.27%, respectively, from the control. Chlorophyll A(Chla), Chlorophyll B(Chlb), Total chlorophyll(Chla + b), Carotenoids(Car), and GSH decreased significantly (P ≤ 0.05) under 40 °C treatment, with peaks of 28.38%, 28.15%, 25.49%, 22.71%, and 15.53%, respectively, compared with the control. Plant secondary metabolite flavonoid and polyphenol contents increased significantly (P ≤ 0.05) under 35 °C treatment, with peaks of 59.95% and 36.14%, respectively, compared with the control. Plant flavonoid and polyphenol contents firstly increased and decreased with time under 40 ℃ treatment (P ≤ 0.05). Most of the physiological and biochemical indexes could recover growth after 35 ℃ treatment, while there was no significant recovery effect after 40 ℃ treatment. This experiment provides some theoretical basis for heat-resistant breeding and large-scale scientific cultivation of D. nobile in the tropics.